This is just a personal thing, but my gf is brunette, but god damn there are some hot blondes you would just want for a night. Not trying to offend anyone here. I mean ill be walking down the street with her and then a hot blonde goes by, I cant help but think......

I vote for blondes but im with a brunette.
The grass is always greener...

I get done for looking. A good trick is to say, OMG honey look at that skank over there and then you can both look and you wont get in trouble. She will always agree with that comment and be proud of your thoughts instead of kicking your ass.